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Transcript 
Lesson #8: Continental Drift
Objective:Create and use a model to
discuss the evidence that supports the
theory of continental drift.
Please pick up the three paged handout from the front. Copy
lesson#, title, and objective in your notebook and title page.
Question? Look at the map below, do see
any puzzle pieces, if so were would they fit?
Copyright © 2010 Ryan P. Murphy
Possible Answers!
Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy
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Area of Focus: Plate Tectonics
Copyright © 2010 Ryan P. Murphy
●
Plate tectonics: The earth’s crust and
upper mantle are broken into sections
called plates.
●
These plates float on the mantle like rafts
(moving very slowly)
Copyright © 2010 Ryan P. Murphy
• There are 8 primary plates and several more
secondary plates that make up the earth’s
landmass.
• African Plate, Antarctic Plate, Australian Plate,
Eurasian Plate, Indian Plate, North American
Plate, Pacific Plate, South American Plate.
• The speed at which the plates move is about
the speed at which your fingernails grow.
Slowest
They are all slow
The African Plate's speed is
estimated at around
2.15 cm (0.85 in) per year
Copyright © 2010 Ryan P. Murphy
• The speed at which the plates move is about
the speed at which your fingernails grow.
The yearly distance
traveled varies from
plate to plate. Some
move at 3
centimeters while
other's move around
6 cm per year.
Fastest
Tonga Microplate Samoa
24 cm (9.4 inches) a year.
Copyright © 2010 Ryan P. Murphy
●
Continental Drift: The gradual movement of
the continents across the earth.
Learn more at… http://www.ucmp.berkeley.edu/
geology/tectonics.html
Copyright © 2010 Ryan P. Murphy
• In 1912, The German geologist Alfred
Wegener proposed continental drift.
– Not accepted until the 1950’s!
Copyright © 2010 Ryan P. Murphy
●
Evidence for continental drift.
●
●
●
●
●
-
Copyright © 2010 Ryan P. Murphy
●
The shapes match.
Copyright © 2010 Ryan P. Murphy
●
Same fossils found on different continents
Copyright © 2010 Ryan P. Murphy
●
The same rock structures on different
continents
Copyright © 2010 Ryan P. Murphy
Example
●
Fossils of plants and animals on Antarctica
Copyright © 2010 Ryan P. Murphy
●
Magnetic layers in sea floor spreading
Copyright © 2010 Ryan P. Murphy
• 800 million years before Pangea, the
continents were together in the
supercontinent Rodinia.
• Climatic changes created a snowball earth
where the entire planet was covered in a mile
thick of ice.
●
Pangea: The “Supercontinent”
●
All of the plates were once together.
Copyright © 2010 Ryan P. Murphy
●
Pangea: The “Supercontinent”
●
All of the plates were once together.
Copyright © 2010 Ryan P. Murphy
● Gondwondaland
and Laurasia were two
mega continents before Pangea.
Copyright © 2010 Ryan P. Murphy
• Future Supercontinent 250 million years
from now.
• What causes continental drift and plate
tectonics?
Copyright © 2010 Ryan P. Murphy
• Answer!
– Convection currents (Remember heat rises)
move the plates
Copyright © 2010 Ryan P. Murphy
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